The two derived nouns answer different questions.
ExampleMeaningType
نَاصِرٌone who helpsIsm Fa'il
مَنْصُوْرٌone who is helpedIsm Maf'ool
A simple distinction: Ism Fa'il points to the doer; Ism Maf'ool points to the one affected by the action.
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Ism Fa'il and Ism Maf'ool
Derived Nouns: The Passive Participle (Ism Maf'ool)
The two derived nouns answer different questions.
ExampleMeaningType
نَاصِرٌone who helpsIsm Fa'il
مَنْصُوْرٌone who is helpedIsm Maf'ool
A simple distinction: Ism Fa'il points to the doer; Ism Maf'ool points to the one affected by the action.